A high-efficiency filter membrane structure, a filter component and a protective mask

Abstract

The present invention discloses a high-efficiency filter membrane structure, including a filter membrane, wherein the filter membrane includes an integrally formed connection portion, a protrusion portion, and a recessed portion, wherein the connection portion is arranged on the outer ring of the filter membrane, the recessed portion is located at the center of the filter membrane, the protrusion portion is arranged between the connection portion and the recessed portion, and a plurality of folds are evenly arranged on the protrusion portion, and each fold is radially arranged around the center of the filter membrane. The present invention also discloses a filter assembly and a protective mask. The high-efficiency filter membrane structure of the present invention can solve the problem that the existing filter membrane has low filtration efficiency under a small projection area; the filter assembly of the present invention cooperates with the above-mentioned filter membrane structure; the protective mask of the present invention cooperates with the above-mentioned filter assembly and can solve the problem that the existing protective mask has poor adaptability and insufficient sealing.

Description

Technical Field

[0001] The invention relates to the field of protective equipment, and in particular to a high-efficiency filter membrane structure, a filter component and a protective mask. Background Art

[0002] According to the statistical analysis of the novel coronavirus infections that have occurred in my country, the main transmission routes of novel coronavirus infections that can be confirmed are direct transmission, aerosol transmission and contact transmission. The risk of infection is high when doctors examine and treat patients. In order to protect the health of frontline medical staff, they need to wear protective equipment. At present, the most commonly used protective equipment is a mask. The filter membrane used in the mask is often a planar structure. Due to the size of the mask, the area of ​​the planar structure is often not too large, so its filtration efficiency (the ratio of the amount of captured dust to the amount of dust in the original air) is very limited. In addition, the existing masks are of the same size and specifications and cannot adapt to different face shapes. Deformed masks have poor sealing and reduced protective effects, and will also cause discomfort to the wearer. Summary of the invention

[0003] The object of the present invention is to provide a high-efficiency filter membrane structure to solve the problem that the existing filter membrane has low filtering efficiency under a smaller projected area.

[0004] Another object of the present invention is to provide a filter assembly to cooperate with the above-mentioned filter membrane structure and solve the problem of low filtration efficiency of existing filter assemblies under a smaller projected area.

[0005] The present invention also aims to provide a protective mask to cooperate with the above-mentioned filter assembly and solve the problems of poor adaptability and insufficient sealing of existing protective masks.

[0006] In order to solve the above problems, the present invention adopts the following technical solutions:

[0007] A high-efficiency filter membrane structure includes a filter membrane, wherein the filter membrane includes an integrally formed connecting portion, a protruding portion and a recessed portion, wherein the connecting portion is arranged on the outer ring of the filter membrane, the recessed portion is located at the center of the filter membrane, the protruding portion is arranged between the connecting portion and the recessed portion, and a plurality of folds are evenly arranged on the protruding portion, and each fold is radially arranged around the center of the filter membrane.

[0008] Preferably, the overall shape of the filter membrane is circular, the connecting portion is annular, the recessed portion is circular, and the diameter of the recessed portion is smaller than the inner diameter of the connecting portion.

[0009] A filter assembly includes a high-efficiency filter membrane structure as described above, and also includes a filter cover, the filter cover includes a filter cover body, the filter cover body is a structure formed by a plurality of ribs connected in a mesh shape, first air holes are respectively formed between different ribs, the circumference of the filter cover body is connected outwardly with an annular step, a plurality of support sheets for supporting the filter membrane are fixedly connected to the filter cover body, the extension direction of the support sheets is perpendicular to the filter cover body and the support sheets are evenly arranged around the center of the filter cover body, and the filter membrane covers the top of the filter cover body.

[0010] Preferably, the connection portion of the filter membrane is fixedly connected to the annular step of the filter cover body, the raised portion of the filter membrane is supported above the filter cover body through a support sheet, and the recessed portion of the filter membrane is in contact with the surface of the center portion of the filter cover body.

[0011] A protective mask, preferably, comprises a filter assembly as described above, and also comprises a mask body, the size of the mask body matches the size of a person's mouth and nose, a ventilation space is formed between the mask body and the user's mouth and nose, the mask body is made of soft elastic material, the side of the mask body close to the user's face is the inner side, the inner tail of the mask body is arc-shaped and curled toward the inner side of the mask body, and the inner tail circumference of the mask body is in contact with the user's face; a ventilation port is provided on the mask body, and the filter assembly is installed at the ventilation port.

[0012] Preferably, a blowout prevention cover is also installed on the outside of the filter cover body; a plurality of clamping columns are arranged at intervals on the outer periphery of the annular step, a second vent hole is formed between two adjacent clamping columns, and the top of the clamping column is hook-shaped; a plurality of buckling parts for cooperating with the filter cover are arranged around the inner wall of the blowout prevention cover, and the buckling parts are buckled with the clamping columns on the filter cover body.

[0013] Preferably, the buckling portion is provided with an arc-shaped clamping edge, which is clamped on the hook-shaped end of the clamping column, and the inner wall of the spray-proof cover is connected with a plurality of limiting bosses for limiting the relative distance between the spray-proof cover and the filter cover.

[0014] Preferably, a clamping ring is connected to the ventilation port, an upper clamping platform and a lower clamping platform are connected to the outer periphery of the filter cover body, an annular clamping groove is formed between the upper clamping platform and the lower clamping platform, and the free end of the clamping ring is interference fit in the annular clamping groove.

[0015] Preferably, a protrusion is provided on the clamping ring, a positioning groove is radially opened on the upper edge of the lower clamping platform, and the protrusion is fitted in the positioning groove.

[0016] Preferably, the inner tail of the mask body is suspended and the thickness of the inner tail of the mask body gradually becomes thinner from the outside to the inside, and the two sides of the nose wing of the mask body are concave.

[0017] By adopting the above technical solution, the present invention has the following advantages:

[0018] 1. Compared with the planar structure of the filter membrane in the prior art, the filter membrane in the present technical solution is a three-dimensional structure. Under the same projected area, the area of ​​the filter membrane itself is greatly increased. Therefore, the three-dimensional structure of the filter membrane can effectively improve the filtration efficiency (the ratio of the amount of captured dust to the dust content of the original air). At the same time, after it is installed on the mask, it does not affect the practicality and aesthetics of the mask.

[0019] At present, in the prior art, the mask filter membrane is basically a planar structure. Due to this inertial design, almost no technicians have made improvements on the planar structure of the mask filter membrane, which has hindered people's research and development in the field of mask filter membrane technology. The present invention overcomes the technical prejudice in the prior art, adopts a three-dimensional filter membrane structure, increases the area of ​​the filter membrane itself under the same projection area, improves the filtration efficiency, and confirms the theory through experimental analysis. Therefore, the present invention has outstanding substantive characteristics and significant technical progress.

[0020] 2. The mask body of the present invention is made of a soft elastic material. The part where the inner tail circumference of the mask body touches the user's face is an arc-shaped structure and curls toward the inner side of the mask body. Due to the elasticity of the mask body itself, the inner tail of the mask body can freely change the part that touches the user's face according to the wearer's face shape, preventing other parts of the mask body from being squeezed and deformed by the face, which does not affect the sealing between the mask body and the user's face, and can adjust the wearing comfort according to the different face shapes of the users.

[0021] 3. The filter cover body is sealed and fixed by interference fit with the clamping ring at the ventilation port. The sealing is convenient and reliable, simple and practical. When the filter assembly needs to be replaced, the filter cover can be directly removed from the ventilation port of the mask body.

[0022] 4. A spray-proof cover is arranged on the outside of the filter cover to prevent pollutants from being directly splashed outward when the user chokes or coughs, thereby improving the protection performance. The spray-proof cover is buckled and connected to the filter cover, and a second vent for gas exchange is left between the buckled parts of the spray-proof cover and the filter cover. The spray-proof cover not only realizes the effect of splash prevention, but also facilitates the smooth flow of gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the structure of the filter membrane in the prior art;

[0024] Figure 2 It is a structural comparison diagram of the filter membrane before and after installation in the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the filter assembly in the present invention;

[0026] Figure 4 It is a schematic diagram of the cross-sectional structure after the filter membrane in the present invention is installed on the filter cover;

[0027] Figure 5 It is a schematic diagram of the structural decomposition of the protective mask of the present invention;

[0028] Figure 6 It is a schematic diagram of the installation of the filter membrane installation tool in the present invention;

[0029] Figure 7 It is a structural schematic diagram of the anti-spray cover in the present invention. DETAILED DESCRIPTION

[0030] In order to make the technical purpose, technical scheme and beneficial effects of the present invention clearer, the following Figure 1-7 The technical solution of the present invention is further illustrated with specific embodiments.

[0031] An embodiment of a high-efficiency filter membrane structure:

[0032] A high-efficiency filter membrane structure includes a filter membrane 1, wherein the filter membrane 1 includes an integrally formed connecting portion 11, a protruding portion 12 and a recessed portion 13. The overall shape of the filter membrane 1 can be circular or elliptical, but is not limited to the above shapes. The connecting portion 11 is arranged on the outer ring of the filter membrane 1, the recessed portion 13 is located at the center of the filter membrane 1, the protruding portion 12 is arranged between the connecting portion 11 and the recessed portion 13, and a plurality of folds 14 are evenly arranged on the protruding portion 12, and each fold 14 is radially arranged around the center of the filter membrane 1.

[0033] Furthermore, in one embodiment of the present invention, the cross-sectional shape of the protrusion 12 may be an inverted U-shape, an inverted V-shape, an inverted W-shape or an M-shape, and the recessed portion 13 is lower than the highest point of the protrusion 12 .

[0034] Furthermore, in one embodiment of the present invention, the overall shape of the filter membrane 1 is circular, the connecting portion 11 is annular, the recessed portion 13 is circular, and the diameter of the recessed portion 13 is smaller than the inner diameter of the connecting portion 11 .

[0035] The filter membrane 1 can be a three-layer structure, a four-layer structure, a five-layer structure, etc. The outermost and innermost filter layers can be made of non-woven fabrics, and the middle filter layer can be made of electrostatic cotton or melt-blown fabric or a combination of the two. The three-layer structure can be used for ordinary civilian masks, and the five-layer structure can be used for medical masks. When the filter membrane 1 is a five-layer structure, from the outside to the inside, it is a non-woven fabric layer, an electrostatic cotton layer, a melt-blown fabric layer, an electrostatic cotton layer, and a non-woven fabric layer. The filter membrane 1 is not limited to the above structure.

[0036] Compared with the planar structure of the filter membrane 1 in the prior art, the filter membrane 1 in the present technical solution is a three-dimensional structure. Under the same projected area, the area of ​​the filter membrane 1 itself is greatly increased. Therefore, the three-dimensional structure of the filter membrane 1 can effectively improve the filtration efficiency (the ratio of the amount of captured dust to the dust content of the original air). At the same time, after it is installed on the mask, it does not affect the practicality and aesthetics of the mask.

[0037] An embodiment of a filter assembly:

[0038] A filter assembly includes a high-efficiency filter membrane structure as described above, and also includes a filter cover 2. The filter cover 2 includes a filter cover body 21. The filter cover body 21 adopts a structure formed by a plurality of ribs connected in a mesh shape. First vents 22 are formed between different ribs. The first vents 22 are distributed throughout the filter cover body 21. This structure is convenient for air intake and can ensure the strength of the overall structure. The circumference of the filter cover body 21 is connected outwardly with an annular step 23. The filter cover body 21 is fixedly connected with a plurality of support sheets 24 for supporting the filter membrane 1. The support sheets 24 can be fixed on the side walls of the annular step 23 or on the ribs of the filter cover body 21. The extension direction of the support sheets 24 is perpendicular to the filter cover body 21 and the support sheets 24 are evenly arranged around the center of the filter cover body 21. The filter membrane 1 covers the top of the filter cover body 21.

[0039] Furthermore, in one embodiment of the present invention, the connecting portion 11 of the filter membrane 1 is fixedly connected to the annular step 23 of the filter cover body 21, and can be connected by ultrasonic welding. The raised portion 12 of the filter membrane 1 is supported above the filter cover body 21 by a supporting sheet 24, and the recessed portion 13 of the filter membrane 1 is in contact with the surface of the center portion of the filter cover body 21.

[0040] When installing the filter membrane 1, the filter membrane installation tool can be used for operation. The filter membrane installation tool is as follows: Figure 6 As shown, the filter membrane installation tool includes a pressing groove, which matches the structure surrounded by each support sheet 24, and a handle is also provided on the pressing groove. The filter cover 2 is placed on the workbench of the ultrasonic welding machine, and then the filter membrane 1 and the filter membrane installation tool are placed on the filter cover 2 in sequence. After the head of the ultrasonic welding machine moves down, it is pressed on the filter cover 2 through the filter membrane installation tool. After the ultrasonic welding line is passed along the annular step 23 for one circle, the filter membrane 1 is fixed on the filter cover 2.

[0041] During the process of pressing the filter membrane 1, the connecting portion 11 of the filter membrane 1 fits with the annular step 23 of the filter cover 2, the recessed portion 13 moves down to fit with the surface of the center portion of the filter cover body 21, the raised portion 12 is supported by the supporting sheet 24, and the folds 14 on the raised portion 12 shrink.

[0042] An embodiment of a protective mask:

[0043] A protective mask includes a filter assembly as described above, and also includes a mask body 3, the size of the mask body 3 matches the size of a person's mouth and nose, a ventilation space is formed between the mask body 3 and the user's mouth and nose, the mask body 3 is made of soft elastic material, such as silicone, rubber, soft PVC, etc., the side of the mask body 3 close to the user's face is the inner side, the inner tail of the mask body 3 is arc-shaped and curled toward the inner side of the mask body 3, and the inner tail of the mask body 3 is in contact with the user's face; the mask body 3 is provided with a ventilation port 4, and the filter assembly is installed at the ventilation port 4. The installation method of the filter assembly and the ventilation port 4 is interference fit, which can ensure sealing.

[0044] Furthermore, in one embodiment of the present invention, a blowout prevention cover 5 is also installed on the outer side of the filter cover body 21; a plurality of clamping columns 25 are arranged at intervals on the outer periphery of the annular step 23, a second vent hole is formed between two adjacent clamping columns 25, and the top of the clamping column 25 is hook-shaped; a plurality of buckling parts for cooperating with the filter cover 2 are arranged on the inner wall circumference of the blowout prevention cover 5, and the buckling parts are buckled with the clamping columns 25 on the filter cover body 21.

[0045] Furthermore, in one embodiment of the present invention, an arc-shaped clamping edge 51 is provided on the buckling portion, and the arc-shaped clamping edge 51 is clamped on the hook-shaped end of the clamping column 25, and a plurality of limiting bosses 52 for limiting the relative distance between the blowout cover 5 and the filter cover 2 are connected to the inner wall of the blowout cover 5. The distance between the bottom surface of the limiting boss 52 and the upper surface of the arc-shaped clamping edge 51 is slightly greater than the height of the hook-shaped end of the clamping column 25, which can ensure that the arc-shaped clamping edge 51 is buckled with the hook-shaped end of the clamping column 25, and prevent the blowout cover 5 from moving significantly along the direction of the clamping column 25.

[0046] The outer side wall of the hook-shaped end of the clamping column 25 is provided with an upper guiding slope, and the lower side of the arc-shaped clamping edge 51 is provided with a lower guiding slope, and the upper guiding slope matches the lower guiding slope. When the anti-spray cover 5 is buckled onto the filter cover 2, the lower guiding slope of the anti-spray cover 5 is first contacted and guided by the upper guiding slope, and then the hook-shaped end of the clamping column 25 is buckled with the arc-shaped clamping edge 51. The structure of the upper guiding slope and the lower guiding slope makes the installation of the anti-spray cover 5 more convenient and reliable.

[0047] The anti-spray cover 5 is a concave structure, and a gas flow space is provided between the anti-spray cover 5 and the filter membrane 1. The two sides of the buckle are respectively fixedly connected with limit blocks 53 for limiting the circumferential position of the clamping column 25, so as to prevent the clamping column 25 from moving in the circumferential direction and ensure the connection reliability of the anti-spray cover 5.

[0048] Furthermore, in one embodiment of the present invention, a clamping ring 6 is connected to the ventilation port 4, an upper clamping platform and a lower clamping platform are connected to the outer periphery of the filter cover body 21, an annular clamping groove 7 is formed between the upper clamping platform and the lower clamping platform, and the free end of the clamping ring 6 is interference fit in the annular clamping groove 7.

[0049] Furthermore, in one embodiment of the present invention, a protrusion is provided on the clamping ring 6, and a positioning groove is radially provided on the lower clamping platform, and the protrusion is installed in the positioning groove. The protrusion and the positioning groove are used together to limit the filter cover body 21.

[0050] Furthermore, in one embodiment of the present invention, the inner tail of the mask body 3 is suspended and the thickness of the inner tail of the mask body 3 gradually becomes thinner from the outside to the inside. The mask body 3 is made of soft elastic material. Due to the elasticity of the mask body 3 itself, when worn, if the user's face is relatively large, the thinner part of the inner tail of the mask body 3 will be compressed. On the one hand, the thinner silicone or rubber can reduce the compression force to a certain extent. On the other hand, the structure leaves sufficient space to prevent the mask body 3 and the face from being squeezed and deformed to avoid affecting breathing. If the inner tail of the mask body 3 is thicker, the space between it and the surface of the mask body 3 is insufficient, and the adjustable space is also insufficient. Therefore, the above design neither affects the sealing between the mask body 3 and the user's face, but also can adjust the wearing comfort according to the different face shapes of the user.

[0051] Furthermore, in one embodiment of the present invention, the nose wings of the mask body 3 are concave on both sides, so that the nose wings of the mask body 3 fit the nose better, reducing the volume of the mask body 3 at the nose, which is beneficial for the use of the wearer of glasses and avoids blocking the line of sight. The mask body 3 is also provided with reinforcing ribs 8, which can enhance the strength of the mask body 3, avoid collapse and deformation when worn, and enhance wearability; specifically, the reinforcing ribs 8 can be set at the position of the mask body 3 corresponding to the cheeks of the user and the position of the mask body 3 corresponding to the bridge of the nose of the user.

[0052] The mask body 3 is provided with fixing belts 9 on both sides, and the filter cover body 21 is provided with a plurality of hooks, and the ends of the fixing belts are connected to the hooks. When wearing, the mask body 3 and the patient are fixed by the hooks and the fixing belts. The fixing belts can be provided with a plurality of holes, so that the wearer can adjust the length of the fixing belts according to the size of the head, thereby enhancing the wearing comfort and sealing performance.

[0053] When installing the filter assembly, first install the filter membrane 1 in the filter cover 2, then align the anti-spray cover 5 with the filter cover 2 and snap it together, wherein the snap-fitting portion on the anti-spray cover 5 cooperates with the clamping column 25 on the filter cover 2, and the limiting boss 52 on the anti-spray cover 5 can be limited. Then, the filter cover body 21 is sealed and fixed by interference fit with the clamping ring 6 at the ventilation port 4. Due to the elasticity of the mask body 3 itself, the clamping ring 6 can be embedded in the annular clamping groove 7 between the upper clamping platform and the lower clamping platform for sealing and fixing.

[0054] A first vent hole 22 is provided on the filter cover body 21, and a second vent hole is formed between two adjacent clamping columns 25 on the filter cover 2. When the gas inside the mask body 3 is exhaled, it first passes through the first vent hole 22, then passes through the filter membrane 1, and after filtration reaches the space between the filter membrane 1 and the anti-spray cover 5, and finally is discharged to the outside through the second vent hole, thereby realizing the exchange of internal and external gases.

[0055] The anti-spray cover 5 is snap-fitted to the filter cover 2, and a second vent hole for gas exchange is left between the snap-fitting parts of the anti-spray cover 5 and the filter cover 2, which not only realizes the splash-proof effect through the anti-spray cover 5, but also facilitates the smooth flow of gas.

[0056] The above embodiments do not impose any formal limitations on the shape, material, structure, etc. of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the protection scope of the technical solution of the present invention.

Claims

1. A high-efficiency filter membrane structure, comprising a filter membrane, characterized in that: The filter membrane comprises an integrally formed connection portion, a raised portion and a recessed portion, wherein the connection portion is arranged at the outer ring of the filter membrane, the recessed portion is located at the center of the filter membrane, the raised portion is arranged between the connection portion and the recessed portion, and a plurality of folds are evenly arranged on the raised portion, and each fold is radially arranged around the center of the filter membrane; The filter membrane is a multi-layer structure consisting of two non-woven fabric layers and an intermediate filter layer located between the two non-woven fabric layers.

2. A high-efficiency filter membrane structure according to claim 1, characterized in that: The overall shape of the filter membrane is circular, the connecting portion is annular, the recessed portion is circular, and the diameter of the recessed portion is smaller than the inner diameter of the connecting portion.

3. A filter assembly, characterized in that: It includes a high-efficiency filter membrane structure as described in claim 1 or 2, and also includes a filter cover, the filter cover includes a filter cover body, the filter cover body is a structure formed by a plurality of ribs connected in a mesh shape, first ventilation holes are respectively formed between different ribs, the circumference of the filter cover body is connected outwardly with an annular step, a plurality of support sheets for supporting the filter membrane are fixedly connected to the filter cover body, the extension direction of the support sheets is perpendicular to the filter cover body and the support sheets are evenly spaced around the center of the filter cover body, and the filter membrane covers the top of the filter cover body; the connecting part of the filter membrane is fixedly connected to the annular step of the filter cover body, the raised part of the filter membrane is supported above the filter cover body by the support sheet, and the recessed part of the filter membrane is in contact with the surface of the center part of the filter cover body.

4. A protective mask, characterized in that: The filter assembly comprises a filter assembly as claimed in claim 3, and further comprises a mask body, the size of the mask body matches the size of a human mouth and nose, a ventilation space is formed between the mask body and the mouth and nose of the user, the mask body is made of a soft elastic material, the side of the mask body close to the face of the user is the inner side, the inner tail of the mask body is arc-shaped and curled toward the inner side of the mask body, and the inner tail of the mask body is in contact with the face of the user; a ventilation port is provided on the mask body, and the filter assembly is installed at the ventilation port; The inner tail of the mask body is suspended and the thickness of the inner tail of the mask body gradually becomes thinner from the outside to the inside.

5. A protective mask according to claim 4, characterized in that: A blowout prevention cover is also installed on the outside of the filter cover body; a plurality of clamping columns are arranged at intervals on the outer periphery of the annular step, a second vent hole is formed between two adjacent clamping columns, and the top of the clamping column is hook-shaped; a plurality of buckling parts for cooperating with the filter cover are arranged on the inner wall circumference of the blowout prevention cover, and the buckling parts are buckled with the clamping columns on the filter cover body.

6. A protective mask according to claim 5, characterized in that: The buckle part is provided with an arc-shaped clamping edge, which is clamped on the hook-shaped end of the clamping column. The inner wall of the anti-spray cover is connected with a plurality of limiting bosses for limiting the relative distance between the anti-spray cover and the filter cover.

7. A protective mask according to claim 6, characterized in that: A clamping ring is connected to the ventilation port, an upper clamping platform and a lower clamping platform are connected to the outer periphery of the filter cover body, an annular clamping groove is formed between the upper clamping platform and the lower clamping platform, and the free end of the clamping ring is interference-fitted in the annular clamping groove.

8. A protective mask according to claim 7, characterized in that: A protrusion is arranged on the clamping ring, a positioning groove is radially opened on the upper edge of the lower clamping platform, and the protrusion is matched and installed in the positioning groove.

9. A protective mask according to claim 8, characterized in that: The nose wings of the mask body are concave on both sides.

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